Check Whether a Page is 404 or not Using PHP. Here in certain situations we need to know the page it whether 404 or not. Here I have some simple php codes to  find it through programmatically. Just use the following code to detect it yourself. $kv_uri = 'https://www.kvcodes.com/testin-url-for-404-error' ; $kv_res = kv_get_page_title($kv_uri); The above code will call a function with parameter of our url ...